Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+======================
+Core API Documentation
+======================
+
+This is the beginning of a manual for core kernel APIs.  The conversion
+(and writing!) of documents for this manual is much appreciated!
+
+Core utilities
+==============
+
+This section has general and "core core" documentation.  The first is a
+massive grab-bag of kerneldoc info left over from the docbook days; it
+should really be broken up someday when somebody finds the energy to do
+it.
+
+.. toctree::
+   :maxdepth: 1
+
+   kernel-api
+   workqueue
+   watch_queue
+   printk-basics
+   printk-formats
+   printk-index
+   symbol-namespaces
+   asm-annotations
+
+Data structures and low-level utilities
+=======================================
+
+Library functionality that is used throughout the kernel.
+
+.. toctree::
+   :maxdepth: 1
+
+   kobject
+   kref
+   assoc_array
+   xarray
+   maple_tree
+   idr
+   circular-buffers
+   rbtree
+   generic-radix-tree
+   packing
+   this_cpu_ops
+   timekeeping
+   errseq
+   wrappers/atomic_t
+   wrappers/atomic_bitops
+
+Low level entry and exit
+========================
+
+.. toctree::
+   :maxdepth: 1
+
+   entry
+
+Concurrency primitives
+======================
+
+How Linux keeps everything from happening at the same time.  See
+Documentation/locking/index.rst for more related documentation.
+
+.. toctree::
+   :maxdepth: 1
+
+   refcount-vs-atomic
+   irq/index
+   local_ops
+   padata
+   ../RCU/index
+   wrappers/memory-barriers.rst
+
+Low-level hardware management
+=============================
+
+Cache management, managing CPU hotplug, etc.
+
+.. toctree::
+   :maxdepth: 1
+
+   cachetlb
+   cpu_hotplug
+   memory-hotplug
+   genericirq
+   protection-keys
+
+Memory management
+=================
+
+How to allocate and use memory in the kernel.  Note that there is a lot
+more memory-management documentation in Documentation/mm/index.rst.
+
+.. toctree::
+   :maxdepth: 1
+
+   memory-allocation
+   unaligned-memory-access
+   dma-api
+   dma-api-howto
+   dma-attributes
+   dma-isa-lpc
+   mm-api
+   genalloc
+   pin_user_pages
+   boot-time-mm
+   gfp_mask-from-fs-io
+
+Interfaces for kernel debugging
+===============================
+
+.. toctree::
+   :maxdepth: 1
+
+   debug-objects
+   tracepoint
+   debugging-via-ohci1394
+
+Everything else
+===============
+
+Documents that don't fit elsewhere or which have yet to be categorized.
+
+.. toctree::
+   :maxdepth: 1
+
+   librs
+   netlink
+
+.. only:: subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`